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SELECT 
  cscart_product_review_prepared_data.product_id AS product_id, 
  cscart_product_review_prepared_data.average_rating AS average_rating, 
  cscart_product_review_prepared_data.reviews_count AS reviews_count 
FROM 
  cscart_product_review_prepared_data 
WHERE 
  cscart_product_review_prepared_data.product_id IN (
    20093, 20094, 20095, 20096, 20097, 20098, 
    20099, 20100, 20101, 20102, 20103, 
    20104, 20105, 20106, 20107, 20108
  ) 
  AND cscart_product_review_prepared_data.storefront_id = 0

Query time 0.00167

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_review_prepared_data",
      "access_type": "ALL",
      "possible_keys": ["PRIMARY"],
      "rows": 5,
      "filtered": 100,
      "attached_condition": "cscart_product_review_prepared_data.storefront_id = 0 and cscart_product_review_prepared_data.product_id in (20093,20094,20095,20096,20097,20098,20099,20100,20101,20102,20103,20104,20105,20106,20107,20108)"
    }
  }
}